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E60 / E61 (2004 - 2010) BMW 5-Series E60 Sedan was first seen in the Unites States in the fall of 2003 with a 2004 Model Year designation. The E61 wagon followed shortly there after. The E60/E61 5 series is now available as a 528i, 528xi, 535i, 535xi, 550i and a 535xi sports wagon! -- View the E60 Wiki

I have a check engine light on my 05 545i that reads on the increased emissions, this went on last week when I put cheap gas and then went off when i put in gas with an octane of 91, but it has come on again. Any help with this would be appreciated.